Can my car kill a battery in 2 weeks?

I found part of the problem. AJ/FormS and others said that a Battery Tender would not charge the battery if the voltage was too low. And you were exactly right. At one time I knew that, but I guess I went brain dead. I took it back to the store, the battery voltage was about 0.1. They were able to charge it up so now I need to find the drain. The reason I said that it should not drain down to zero in 2 weeks, is because I had never had that problem in the last 2 years. I hate it when problems occur for no apparent reason, but that happens to everyone.

I plan to run a wire through my multimeter to see how many amps are draining - like one of you suggested. The MM goes up to 10 amps, so I should be good. Then I will go through your other suggestions in finding the leak. I've seen those threads before, but hoped it would never happen to me. HA.

Thank you all so much!

If you have another vehicle and booster cables you can "activate" the battery that way as well. Just don't try it on a frozen battery. I would hook up the jumpers with the source NOT RUNNING and let it set for "whatever you have time for" as long as 5 minutes. This will give it a chance to build a little bit without trashing the alternator. Then start the source vehicle and let it run for maybe 5 more. DO NOT try and charge an absolutely dead battery with an alternator. Some will fail.

Then put it back on the charger and see if it "picks up"